Use null type argument vector instead of vector of Dynamic for a generic raw

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "vm/ast_printer.h"
 #include "vm/flags.h"
 #include "vm/intermediate_language.h"
 #include "vm/longjump.h"
 #include "vm/os.h"
 #include "vm/parser.h"
+#include "vm/stub_code.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_flow_graph, false, "Print the IR flow graph.");
 DECLARE_FLAG(bool, enable_type_checks);
 DECLARE_FLAG(bool, print_ast);
 
 void EffectGraphVisitor::Append(const EffectGraphVisitor& other_fragment) {
   ASSERT(is_open());
   if (other_fragment.is_empty()) return;
@@ skipping 1076 matching lines @@
     ConstructorCallNode* node,
     intptr_t start_index,
     ZoneGrowableArray<Value*>* args) {
   const Class& cls = Class::ZoneHandle(node->constructor().owner());
   ASSERT(cls.HasTypeArguments() && !node->constructor().IsFactory());
   if (node->type_arguments().IsNull() ||
       node->type_arguments().IsInstantiated()) {
     AddInstruction(
         new BindInstr(start_index, new ConstantVal(node->type_arguments())));
     args->Add(new TempVal(start_index));
-    // Null instantiator.
+    // No instantiator required.
+    const Smi& no_instantiator =
+        Smi::ZoneHandle(Smi::New(StubCode::kNoInstantiator));
     AddInstruction(new BindInstr(
-        start_index + 1, new ConstantVal(Object::ZoneHandle())));
+        start_index + 1, new ConstantVal(no_instantiator)));
     args->Add(new TempVal(start_index + 1));
     return;
   }
   // The type arguments are uninstantiated.
   // Place holder to hold uninstantiated constructor type arguments.
   AddInstruction(new BindInstr(start_index,
                                new ConstantVal(Object::ZoneHandle())));
   Value* instantiator_value =
       BuildInstantiatorTypeArguments(node->token_index(), start_index + 1);
   AddInstruction(new PickTempInstr(start_index + 2, start_index + 1));
@@ skipping 937 matching lines @@
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len));
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart